XERUS—XYLOTHERIUM. 711 
Xerus—Continued. 
Type: Sciurus ( Xerus) brachyotus Hemprich & Ehrenberg (=X. rutilus Cretzsch- 
mar, 1826), from the Gedam Mountains, Abyssinia. 
Xerus: Enpos, dry—so called from the character of the fur, which is harsh and 
often spiny. 
Xesmodon Brera, 1899. Ungulata, Litopterna, Proterotheriid:e. 
Comun. Mus. Nac. Buenos Aires, I, No. 3, p. 79, May 24, 1899. 
New name for Glyphodon Roth, 1899, which is preoccupied by Glyphodon Günther, 
1858, a genus of Reptilia. 
Extinct. Based on a skull containing the last two upper molars. 
Xesmodon: €€6a, that which is scraped or smoothed; 66@v=66ovs, tooth. 
Xiphacodon (see Ziphacodon). Creodonta, Uintacyonid:e. 
Xiphias, Xiphius (see Ziphius). Cete, Physeteridie. 
Xiphodon (subg. of Anoplotherium) Cuvier, 1822. Ungulata, Anoplotheriidie. 
Recherches Ossem. Foss., nouv. éd., III, 60-62, pl. 111, 1822; DEswaAnEsT, Mamma- 
logie, II, Suppl., 545, 1822; Guy Comptes rendu XXX, 603, Jan.-June, 
1850 GHEE to generic rank). 
Xyphodon Kaur, Class. Siugethiere und Vogel, 82, 1844. 
Type: Anoplotherium gracile Cuvier, from the Eocene of the Paris basin, France. 
Extinct. 
Xiphodon: Eidos, sword; 66@v = d6o0vs, tooth—‘‘ que je tire de la forme tran- 
chante d'une partie de ses dents."  (CuviER.) 
Xiphodontherium FiLnor, 1877. Ungulata, Artiodactyla, Anoplotheriid:e. 
Ann. Sci. Géol. de Paris, VIII, art. No. 1, pp. 198-205, pl. 19 figs. 317-323, 1877 
Niphodontotherium Dauron, Geol. Record, for 1877, Index new names, p. 385, 1880. 
Species: Viphodontherium primzvum Filhol, and X. secundarium Filhol, from the 
Phosphorites of Quercy, near Mouillae, France. 
Niphodontherium: Xiphodon; 8npiov, wild beast. 
Xotodon AMEGHINO, 1887. Ungulata, Toxodontia, Toxodontide. 
Obs. Gen. sobre Mamif. Estinguidos llamados Toxodontes, 53, May, 1887 
Zotodon LYDEKKER, Nat. Sci., IV, p. 30, Jan., 1894. 
Type: Toxodon foricurvatus Ameghino, from the vicinity of the city of Paraná, 
Entre Rios, Argentina. 
Extinet. Based on the lower jaw. 
Xotodon: Anagram of Toxodon. 
Xotoprodon Amecuino, 1891. oae Toxodontia, Nesodontid:e. 
Revista Argentina Hist. Nat., I, entr. 4a, 241, Aug. 1, 1891. 
Type: Notoprodon solidus Ameghino, from the Eocene 3s southern Patagonia. 
Extinct. 
Xotoprodon: Anagram of Protoxodon. 
Xylomys (subgenus of Heteromys) MERRIAM, 1902. Glires, Heteromyide. 
Proc. Biol. Soc. Wash., XV, 43-44, Mar. 5, 1902. 
Type: Heteromys (Xylomys) nelsoni Merriam, from Pinabete, Chiapas, Mexico. 
Xylomys: &6Aov, wood; 0s, mouse—in allusion to its habitat in humid forests 
on mountain slopes. 
Xylotherium Mercerat, 1891. Ungulata, Astrapotheroidea, Astrapotheriid:e. 
Revista Mus. La Plata, I, 254-255, 1890-91. 
Type: .Xylotherium mirabile Mercerat, from the Eocene of Santa Cruz, Patagonia. 
Extinct. Based on ‘un maxilar inferior, al que le falta la parte proximal; el 
borde incisivo también está destruido." 
Xylotherium: &6Àov, wood; Gypiorv, wild beast. 
